On Wed, May 28, 2014 at 10:37:51AM +0300, Mika Westerberg wrote:
> I sent you the whole log privately so that I don't spam everyone.
>
> Summary is here:
>
> May 28 10:24:23 lahna kernel: scsi 14:0:0:0: Direct-Access JetFlash
> Transcend 4GB 8.07 PQ: 0 ANSI: 4
> May 28 10:24:23 lahna kernel: sd 14:0:0:0: Attached scsi generic sg4 type 0
> May 28 10:24:23 lahna kernel: sd 14:0:0:0: [sdc] 7864320 512-byte logical
> blocks: (4.02 GB/3.75 GiB)
> May 28 10:24:23 lahna kernel: sd 14:0:0:0: [sdc] Write Protect is off
> May 28 10:24:23 lahna kernel: sd 14:0:0:0: [sdc] Mode Sense: 23 00 00 00
> May 28 10:24:23 lahna kernel: sd 14:0:0:0: [sdc] Write cache: disabled, read
> cache: enabled, doesn't support DPO or FUA
> May 28 10:24:23 lahna kernel: sdc: sdc1
> May 28 10:24:23 lahna kernel: sd 14:0:0:0: [sdc] Attached SCSI removable disk
>
> Here I detached the USB stick:
>
> May 28 10:24:32 lahna kernel: usb 3-10.4: USB disconnect, device number 6
> May 28 10:24:32 lahna kernel: check_submounts_and_drop[/dev/block/8:33]; CPU
> 4 PID 576 [systemd-udevd]
> May 28 10:24:32 lahna kernel: dput[/dev/block/8:33]; CPU 4 PID 576
> [systemd-udevd]
> May 28 10:24:32 lahna kernel:
> check_submounts_and_drop[3-10/3-10.4/3-10.4:1.0/host14]; CPU 1 PID 1683
> [systemd-udevd]
> May 28 10:24:32 lahna kernel:
> shrink[3-10.4:1.0/host14/target14:0:0/subsystem]; CPU 1 PID 1683
> [systemd-udevd]
> May 28 10:24:32 lahna kernel: shrink[host14/target14:0:0/14:0:0:0/rev]; CPU 1
> PID 1683 [systemd-udevd]
> May 28 10:24:32 lahna kernel: shrink[host14/target14:0:0/14:0:0:0/vendor];
> CPU 1 PID 1683 [systemd-udevd]
> May 28 10:24:32 lahna kernel: shrink[host14/target14:0:0/14:0:0:0/model]; CPU
> 1 PID 1683 [systemd-udevd]
> May 28 10:24:32 lahna kernel: check_submounts_and_drop[/dev/block/8:32]; CPU
> 4 PID 576 [systemd-udevd]
> ...
> May 28 10:24:32 lahna kernel:
> check_submounts_and_drop[0000:00:14.0/usb3/3-10/3-10.4]; CPU 6 PID 1684
> [systemd-udevd]
> May 28 10:24:32 lahna kernel:
> check_submounts_and_drop[0000:00:14.0/usb3/3-10/3-10.4]; CPU 7 PID 1685
> [systemd-udevd]
> May 28 10:24:32 lahna kernel: shrink[usb3/3-10/3-10.4/ltm_capable]; CPU 7 PID
> 1685 [systemd-udevd]
> May 28 10:24:32 lahna kernel: A
...
Hmm... As it is, we have d_walk() trying _very_ hard in those situations.
Could you add that on top of the previous and see if livelock changes?
diff --git a/fs/dcache.c b/fs/dcache.c
index 42ae01e..4ce58d3 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1209,7 +1209,7 @@ static enum d_walk_ret select_collect(void *_data, struct
dentry *dentry)
* ensures forward progress). We'll be coming back to find
* the rest.
*/
- if (!list_empty(&data->dispose))
+ if (data->found)
ret = need_resched() ? D_WALK_QUIT : D_WALK_NORETRY;
out:
return ret;
--
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